743
FNUS75 KBOI 161659
FWSBOI
SPOT FORECAST FOR JOHNSON FORK PILES...USFS
NATIONAL WEATHER SERVICE BOISE ID
959 AM MST TUE DEC 16 2025
FORECAST IS BASED ON IGNITION TIME OF 1000 MST ON DECEMBER 17.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE AT (208)334-9060, IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
..WIND ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST WEDNESDAY
..COLD FRONT TO BRING RAIN AND WIND TONIGHT INTO WEDNESDAY
DISCUSSION
A SYSTEM WILL BRING RAIN TO THE BURN AREA TONIGHT. ON WEDNESDAY,
STEADY RAIN WILL TRANSITION TO SHOWERS AS A COLD FRONT MOVES
ACROSS THE AREA. CURRENTLY, THE FRONT IS EXPECTED TO ARRIVE AROUND
0800-0900 WITH A SHARP WIND SHIFT FROM SOUTH TO NORTHWEST, AND
VERY GUSTY WINDS ALONG AND BEHIND THE FRONT. RIDGELINE WINDS WILL
BE EVEN STRONGER. THERE IS ALSO A VERY SLIGHT (LESS THAN 10%
CHANCE) OF THUNDERSTORMS ALONG THE FRONT. SHOWERS SHOULD END BY
AROUND 1000, WITH A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS IN THE
AFTERNOON. WITH COLDER AIR IN PLACE BEHIND THE FRONT, THE NEXT
SYSTEM SET TO ARRIVE ON THURSDAY WILL BRING ACCUMULATING SNOW TO
THE BURN SITE.
WEDNESDAY
SKY/WEATHER.........A NEAR 100% CHANCE OF RAIN SHOWERS BEFORE 1000,
THEN A 20% CHANCE OF A RAIN/SNOW MIX IN THE
AFTERNOON. DECREASING CLOUDS IN THE AFTERNOON.
MAX TEMPERATURE.....44 TO 49.
MIN HUMIDITY........51 TO 56 PERCENT.
CWR.................90 PERCENT.
WIND - 20 FOOT......SOUTH 5 TO 10 MPH WITH GUSTS TO 20 MPH BEFORE 0800,
SHIFTING TO NORTHWEST 10 TO 20 MPH AROUND 0800-0900.
GUSTS 30 TO 45 MPH 0800-1200, DECREASING TO 20 TO 30
MPH IN THE AFTERNOON.
MIXING HEIGHT.......5000 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 30 MPH.
VENTILATION INDEX...1500 EXCELLENT.
WEDNESDAY NIGHT
SKY/WEATHER.........A SLIGHT CHANCE OF SNOW OVERNIGHT. CHANCE OF SNOW
20 PERCENT. LITTLE OR NO SNOW ACCUMULATION.
MIN TEMPERATURE.....26 TO 31.
MAX HUMIDITY........87 TO 92 PERCENT.
CWR.................10 PERCENT.
WIND - 20 FOOT......NORTH 3 TO 6 MPH IN THE EVENING BECOMING LESS
THAN 3 MPH OVERNIGHT.
MIXING HEIGHT.......700 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH.
VENTILATION INDEX...35 POOR.
THURSDAY
SKY/WEATHER.........SNOW, POSSIBLY MIXING WITH RAIN IN THE AFTERNOON.
CHANCE OF PRECIPITATION NEAR 100 PERCENT. SNOW
ACCUMULATION 2 TO 5 INCHES.
MAX TEMPERATURE.....35 TO 40.
MIN HUMIDITY........80 TO 90 PERCENT.
CWR.................95 PERCENT.
WIND - 20 FOOT......SOUTHEAST AROUND 5 MPH.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH.
VENTILATION INDEX...75 POOR.
FORECASTER...TANGEN
REQUESTED BY...NICK BECHARAS
TYPE OF REQUEST...PRESCRIBED
.TAG 2527706.0/BOI
.DELDT 12/17/25
.FORMATTERVERSION 2.0.0
.EMAIL GORDON.WELLS@USDA.GOV,NICHOLAS.BECHARAS@USDA.GOV
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